@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix isothes: <http://purl.org/iso25964/skos-thes#> .

<https://concepts.sagepub.com/social-science/concept/liquids>
  skos:prefLabel "liquids"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/liquid_fuels> .

<https://concepts.sagepub.com/social-science/concept/shale_oils>
  skos:prefLabel "shale oils"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/liquid_fuels> .

<https://concepts.sagepub.com/social-science/concept/fuel>
  skos:prefLabel "fuel"@en ;
  a skos:Concept ;
  skos:narrower <https://concepts.sagepub.com/social-science/concept/liquid_fuels> .

<https://concepts.sagepub.com/social-science/concept/liquid_fuels>
  skos:narrower <https://concepts.sagepub.com/social-science/concept/shale_oils>, <https://concepts.sagepub.com/social-science/concept/petroleum> ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/liquids>, <https://concepts.sagepub.com/social-science/concept/fuel> ;
  skos:prefLabel "liquid fuels"@en ;
  a skos:Concept .

<https://concepts.sagepub.com/social-science/concept/conceptgroup/concepts>
  a skos:Collection, isothes:ConceptGroup ;
  skos:prefLabel "concepts"@en ;
  skos:member <https://concepts.sagepub.com/social-science/concept/liquid_fuels> .

<https://concepts.sagepub.com/social-science/concept/petroleum>
  skos:prefLabel "petroleum"@en ;
  a skos:Concept ;
  skos:broader <https://concepts.sagepub.com/social-science/concept/liquid_fuels> .